Vreejack wrote:
When held at room temperature solid CO2 will expand completely into a
much larger volume of gas. To prevent this you must either supply
enough volume for it to expand into ( a big tank) or apply enough
pressure to liquify it. WHen compressed at about five atmospheres (to
the best of my memory) CO2 will liquify at room temperature, so what
happens is the solid melts, expanding slightly into the liquid, which
evaporates into the container to maintain a constant vapor pressure of
about 5 atm (or around 75 psia). That's about 60 psi about the
pressure in your house, so you need some gear that will be able to
handle that. Such equipment is already sold for planted tanks, though
they usually assume you want to use a commercially supplied CO2
canister.


You're of by more than an order of magnitude. The liquid CO2 will
continue to expand until it reaches about 60 bar (~900 psi) at room
temperature. Put it in a sealed container that cannot withstand that
pressure and it will explode.

Best regards,
Bob